| 1 | /* sysselect.h - System-dependent definitions for the select function. |
| 2 | Copyright (C) 1995, 2001-2014 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GNU Emacs. |
| 5 | |
| 6 | GNU Emacs is free software: you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation, either version 3 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | GNU Emacs is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #ifndef SYSSELECT_H |
| 20 | #define SYSSELECT_H 1 |
| 21 | |
| 22 | #ifndef DOS_NT |
| 23 | #include <sys/select.h> |
| 24 | #endif |
| 25 | |
| 26 | /* The w32 build defines select stuff in w32.h, which is included |
| 27 | where w32 needs it, but not where sysselect.h is included. The w32 |
| 28 | definitions in w32.h are incompatible with the below. */ |
| 29 | #ifndef WINDOWSNT |
| 30 | #ifdef FD_SET |
| 31 | #ifndef FD_SETSIZE |
| 32 | #define FD_SETSIZE 64 |
| 33 | #endif |
| 34 | #else /* no FD_SET */ |
| 35 | #define FD_SETSIZE 32 |
| 36 | typedef int fd_set; |
| 37 | |
| 38 | /* Define the macros to access a single-int bitmap of descriptors. */ |
| 39 | #define FD_SET(n, p) (*(p) |= (1 << (n))) |
| 40 | #define FD_CLR(n, p) (*(p) &= ~(1 << (n))) |
| 41 | #define FD_ISSET(n, p) (*(p) & (1 << (n))) |
| 42 | #define FD_ZERO(p) (*(p) = 0) |
| 43 | #endif /* no FD_SET */ |
| 44 | #endif /* not WINDOWSNT */ |
| 45 | |
| 46 | #if !defined (HAVE_SELECT) |
| 47 | #define select sys_select |
| 48 | #endif |
| 49 | |
| 50 | #ifdef MSDOS |
| 51 | #define pselect sys_select |
| 52 | #endif |
| 53 | |
| 54 | #ifndef WINDOWSNT |
| 55 | INLINE_HEADER_BEGIN |
| 56 | |
| 57 | /* Check for out-of-range errors if ENABLE_CHECKING is defined. */ |
| 58 | |
| 59 | INLINE void |
| 60 | fd_CLR (int fd, fd_set *set) |
| 61 | { |
| 62 | eassume (0 <= fd && fd < FD_SETSIZE); |
| 63 | FD_CLR (fd, set); |
| 64 | } |
| 65 | |
| 66 | INLINE bool |
| 67 | fd_ISSET (int fd, fd_set *set) |
| 68 | { |
| 69 | eassume (0 <= fd && fd < FD_SETSIZE); |
| 70 | return FD_ISSET (fd, set) != 0; |
| 71 | } |
| 72 | |
| 73 | INLINE void |
| 74 | fd_SET (int fd, fd_set *set) |
| 75 | { |
| 76 | eassume (0 <= fd && fd < FD_SETSIZE); |
| 77 | FD_SET (fd, set); |
| 78 | } |
| 79 | |
| 80 | #undef FD_CLR |
| 81 | #undef FD_ISSET |
| 82 | #undef FD_SET |
| 83 | #define FD_CLR(fd, set) fd_CLR (fd, set) |
| 84 | #define FD_ISSET(fd, set) fd_ISSET (fd, set) |
| 85 | #define FD_SET(fd, set) fd_SET (fd, set) |
| 86 | |
| 87 | INLINE_HEADER_END |
| 88 | |
| 89 | #endif /* !WINDOWSNT */ |
| 90 | |
| 91 | #endif |